Mail: IMAP Share Folder Presentation

[RabbitDuck]

Nextcloud 19
Mail 1.4.1

Hi,
Have some mail folders shared by other users in our IMAP server.
In mail app, it shows duplicated entry and one of them is not accessible.
For example, have 3 accounts shared their inbox to me, and the list shown as the below image:

Each share has duplicated folders and only the lower one is accessible.

Below is the share folders in Thunderbird

I cannot find any mail parameter in the configure file can change the presentation, please help.
Thanks!

[ChristophWurst]

Please do not ignore the issue template. We structure each bug report similarly for a reason.

[RabbitDuck]

Expected behavior

Show share account and share folder name in tree structure

Actual behavior

Show share folders in a list without indentation and show duplicated entry

Mail app

Mail app version: 1.4.1

Mailserver or service: Dovecot

Server configuration

Operating system: Slackware 14.2

Web server: Nginx

Database: MariaDB

PHP version: 7.4

Nextcloud Version: 19.0.1

Client configuration

Browser: Firefox 79.0

Operating system: Ubuntu